It uses top quality samples of real spaces to create reverb, ranging from Sydney Opera House to the cockpit of a Jumbo Jet. Altiverb 6 offers the most extensive set of parameters, it supports all professional plug-in formats including protools TDM on the Mac, parameter automation and surround. Altiverb 6 gives you a choice between iLok SmartKey or Challenge/response copy protection, it lets you sample your own spaces (currently Mac only), and Altiverb is efficient on your cpu.